1. 应用场景

开发中经常遇到

• 路由跳转时拿不到context怎么办，eg: token失效/异地登录跳转登录页面。
• 获取不到当前路由名称怎么办，eg: 点击push推送跳转指定路由，如果已经在当前页面就replace，如果不在就push。
• 注册监听路由跳转,做一些想做的事情 ，eg：不同路由，显示不同状态栏颜色。
• 等等...

2. 解决方案

解决思路：

1. MaterialApp 的routes属性赋值路由数组，navigatorObservers属性赋值路由监听对象NavigatorManager。
2. 在NavigatorManager里实现NavigatorObserver的didPush/didReplace/didPop/didRemove，并记录到路由栈List _mRoutes中。
3. 将实时记录的路由跳转，用stream发一个广播，哪里需要哪里注册。

3. 具体实现

main.dart

MaterialApp(
 navigatorObservers: [NavigatorManager.getInstance()],routes: NavigatorManager.configRoutes,...
)

navigator_manager.dart

class NavigatorManager extends NavigatorObserver {
 /* 配置routes */
 static Map<String,WidgetBuilder> configRoutes = {
 PackageInfoPage.sName: (context) =>
 SplashPage.sName: (context) => SplashPage(),LoginPage.sName: (context) => SplashPage()),MainPage.sName: (context) => SplashPage(),//...
 }
 // 当前路由栈
 static List<Route> _mRoutes;
 List<Route> get routes => _mRoutes;
 // 当前路由
 Route get currentRoute => _mRoutes[_mRoutes.length - 1];
 // stream相关
 static StreamController _streamController;
 StreamController get streamController=> _streamController;
 // 用来路由跳转
 static NavigatorState navigator;

 /* 单例给出NavigatorManager */
 static NavigatorManager navigatorManager;
 static NavigatorManager getInstance() {
 if (navigatorManager == null) {
  navigatorManager = new NavigatorManager();
  _streamController = StreamController.broadcast();
 }
 return navigatorManager;
 }

 // replace 页面
 pushReplacementNamed(String routeName,[WidgetBuilder builder]) {
 return navigator.pushReplacement(
  CupertinoPageRoute(
  builder: builder ?? configRoutes[routeName],settings: RouteSettings(name: routeName),),);
 }

 // push 页面
 pushNamed(String routeName,[WidgetBuilder builder]) {
 return navigator.push(
  CupertinoPageRoute(
  builder: builder ?? configRoutes[routeName],);
 }

 // pop 页面
 pop<T extends Object>([T result]) {
 navigator.pop(result);
 }

 // push一个页面， 移除该页面下面所有页面
 pushNamedAndRemoveUntil(String newRouteName) {
 return navigator.pushNamedAndRemoveUntil(newRouteName,(Route<dynamic> route) => false);
 }

 // 当调用Navigator.push时回调
 @override
 void didPush(Route route,Route prevIoUsRoute) {
 super.didPush(route,prevIoUsRoute);
 if (_mRoutes == null) {
  _mRoutes = new List<Route>();
 }
 // 这里过滤调push的是dialog的情况
 if (route is CupertinoPageRoute || route is MaterialPageRoute) {
  _mRoutes.add(route);
  routeObserver();
 }
 }

 // 当调用Navigator.replace时回调
 @override
 void didReplace({Route newRoute,Route oldRoute}) {
 super.didReplace();
 if (newRoute is CupertinoPageRoute || newRoute is MaterialPageRoute) {
  _mRoutes.remove(oldRoute);
  _mRoutes.add(newRoute);
  routeObserver();
 }
 }

 // 当调用Navigator.pop时回调
 @override
 void didPop(Route route,Route prevIoUsRoute) {
 super.didPop(route,prevIoUsRoute);
 if (route is CupertinoPageRoute || route is MaterialPageRoute) {
  _mRoutes.remove(route);
  routeObserver();
 }
 }

 @override
 void didRemove(Route removedRoute,Route oldRoute) {
 super.didRemove(removedRoute,oldRoute);
 if (removedRoute is CupertinoPageRoute || removedRoute is MaterialPageRoute) {
  _mRoutes.remove(removedRoute);
  routeObserver();
 }
 }

 void routeObserver() {
 LogUtil.i(sName,'&&路由栈&&');
 LogUtil.i(sName,_mRoutes);
 LogUtil.i(sName,'&&当前路由&&');
 LogUtil.i(sName,_mRoutes[_mRoutes.length - 1]);
 // 当前页面的navigator，用来路由跳转
 navigator = _mRoutes[_mRoutes.length - 1].navigator;
 streamController.sink.add(_mRoutes);
 }
}

4. 如何使用

token失效跳转

case 401:
  ToastUtil.showRed('登录失效,请重新登陆');
  UserDao.clearAll();
  NavigatorManager.getInstance().pushNamedAndRemoveUntil(LoginPage.sName);
  break;

点击push推送跳转

static jumpPage(String pageName,[WidgetBuilder builder]) {
  String currentRouteName = NavigatorManager.getInstance().currentRoute.settings.name;
  // 如果是未登录，不跳转
  if (NavigatorManager.getInstance().routes[0].settings.name != MainPage.sName) {
   return;
  }

  // 如果已经是当前页面就replace
  if (currentRouteName == pageName) {
   NavigatorManager.getInstance().pushReplacementNamed(pageName,builder);
  } else {
   NavigatorManager.getInstance().pushNamed(pageName,builder);
  }
}

监听路由改变状态栏颜色

class StatusBarUtil {
   static List<String> lightRouteNameList = [
    TaskhallPage.sName,//...
   ];
   static List darkRoutNameList = [
    SplashPage.sName,LoginPage.sName,MainPage.sName,//...
   ];

   static init() {
    NavigatorManager.getInstance().streamController.stream.listen((state) {
      setupStatusBar(state[state.length - 1]);
    })
   }

   setupStatusBar(Route currentRoute) {
    if (lightRouteNameList.contains(currentRoute.settings.name)) {
     setLight();
    } else if (darkRoutNameList.contains(currentRoute.settings.name)) {
     setDart();
    }
   }
}

完结，撒花🎉

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